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Chrysler kid, that was me that put the VX Transmission into my HX. Yes, it did completely screw lean burn in fifth gear. Hence why I told OP to down his tire size if he went with a VX Transmission.
OP, lean burn in the D16Y5 will only engage above 2600rpm, no exceptions. This is why I told you VX tans +RE92'S are your best bet at success with your quest for MPG. The VX trans will lower your RPM, but the Re92's will offset the lower gearing, improve your city acceleration and give you lower rolling resistance. If you go Taller gearing, go 3.73, nothing lower unless your going to go Re92's. I almost wanna say 3.73's with RE92'S would be the best combination, but testing or some math would be required to know what speed 70mph would be.
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